Floor duster



FIG. 1 is a perspective view of a floor duster;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof (with the left a mirror image thereof);

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines in the figures represent portions of the floor duster that form no part of the claimed design. 

CLAIM The ornamental design for a floor duster, as shown, and described. 